Safety-valve



(No Model.)

, A. 1-1. JARECKI.

SAFETY VALVE. No. 287,131. Patented Oct. 23, 1883.

N Perms Pmmulmgu mn Washington. me,

ALBERT H. JARECKI, OF ERIE, PENNSYLVANIA.

SAFETY-VALV E.

SPECIFICATION forming part of Letters Patent No. 287,131, dated October23, 1883.

Application filed June 15, 1883. (No model.)

'To all whom it may concern.-

exact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same.

This invention relates to safety-valves; and it consists in providingnew and useful improvements in the construction of the valves of saiddevice, as will fully and at length appear in the following descriptionand claims.

A second feature of the invention relates to devices for opening thevalve by hand.

The first feature in the construction of the valve consists in makingthe upper seating of adifferential valve in the form of a cylinder andpiston, the piston being adapted to be lifted above the cylinder when awide escape for steam is required.

The second feature of the valve consists in providing the said pistonwith openings through it, so that a partial escape of steam can be hadbefore the piston is lifted wholly out of the cylinder.

The third feature of the valve consists inthe form which may be given tothe said openings through the piston, whereby they will afford more andmore opening the higher the valve rises.

The improvement in, the means for springing the valve by hand consistsin the combination and arrangement of a compound leverage, whereby lessexertion is required to raise the valve.

The invention is illustrated in the drawings by three figures, all ofwhich are vertical sectional views. The construction is somewhat variedin each figure,for the purpose of showing variety in the manner ofapplying the i11- vention.

In Figures 1 and 3 the differential valves are shown as solid-i. 6.,made of one piece of metal-while in Fig. 2 is shown a valve composed oftwo parts, 0 0*; but it will be seen that in all cases the upper part isshown as a narrow piston working in a cylinder. In Fi 3 the piston isnot provided with openings at all; but the cylinder is, (see c,) and ahooding-ring, A, is used to regulate the size of the openings, and sofix the degree of pressure which will be required to lift the pistonwholly out of the cylinder, and thus afford a free escape. In Fig. 1 thepiston is shown as provided with openings a in its rim and bin its disk.It will be seen that this device will afford a graduated escape as thepiston is lifted, for as the holes a pass above the upper edge of thecylinder the escape is increased, and when the piston is forced abovethe cylinder the escape is free, as in the construction shown in Fig. 3.

In Fig. 2 the piston is shown as having its rim serrated, thus affordingflaring openings (1. This is perhaps the most preferable construction,as it gives a still more graduated escape as the piston is lifted,for asthe piston rises above the edge of the cylinder the holes (I grow wideras well as longer.

I am aware that two perforated cylindersone within the other -havc beencombined to operate in a safety-valve for a dissimilar purpose, (seePatent N 0. 215,242, May 13, 1879,) and I do not, therefore, claim as myinvention that which would include such a construction.

A second feature of my invention consists in providing an improved leverfor lifting the valve manually. This consists of the ,compound lever EE. The lever E is pivoted to the case B at e, and extends into the caseand under the valve-stem spring-ledge. 011 the top of this lever ispivoted the second lever, E, at 6. This lever has a foot which bearsupon a l'ug, l), 011 the side of the shell or case B. The engineersconnecting-cord connects with the lever E. It will be evident to any onethat much less exertion will be required 'to raise the valve with thisleverage than by a single lever, as'is now commonly used.

IVhat I claim as new is 1. In a safety-valve, substantially as described, the combination of a cylinder and a differential valve, theupper part of which is a narrow flanged or rimmed piston within thecylinder, from which it can be lifted to allow steam to escape betweenits flanged rim and the upper edge of the cylinder, for the purpose setforth.

2. In a safety-valve, substantially as described, the combination of acylinder and a differential valve, the upper part of which is a narrowflanged or rimmed piston provided with passages in its rim, andseated'within a cylinder, from which itcan be lifted partially orwholly, and when partially lifted will afl'ord a partial escape throughsaid passages, as set forth. 7

3. In a safety-valve, the combination, substantially as shown, of acylinder and a differential valve, the upper part of which is a pistonhaving a narrow serrated rim or flange afi'ording flaring openings (1,and seated within said cylinder, from which it can be lifted ALBERT H.JARECKI.

\Vitnesses: I

J NO. K. HALLOCK, RoB'r. H. PORTER.

